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#include 

#include 

#include 

#include 

const char msg1[]="Hello!";

char msg2='\0';

int main()

{

    sockaddr addr={AF_INET4, PORT(23) , 0, 0};

    int sk1=socket(AF_INET4, SOCK_STREAM, IPPROTO_TCP);

    printf("Open socket: %d. Error: %d\n",sk1, err_code);

    bind(sk1, &addr,sizeof(addr));

    printf("Socket binding. Error: %d\n", err_code);

    listen(sk1, 1);

    printf("Listening to a socket. Error: %d\n", err_code);

    int sk2 = accept(sk1, &addr, sizeof(addr));

    printf("Accept done. Error: %d\n", err_code);

    send(sk2, msg1, strlen(msg1),MSG_NOFLAG);

    printf("Send message: '%s'  Error: %d\n", msg1, err_code);

    puts("Received data:");

    while(msg2!='!')

    {

        recv(sk2, &msg2, 1, MSG_NOFLAG);

        printf("%c",msg2);

    }

    close(sk1);

    close(sk2);

    puts("\nGood bye!");

    exit(0);

}